fix: configure stdio-based MCP servers (penpot, imap)

- Set penpot-mcp restart: "no" for on-demand execution
- Create custom Dockerfile for imap-mcp with python module entrypoint
- Fix IMAP_HOST environment variable naming (was IMAP_SERVER)
- Update .env and docker-compose.yml for IMAP_HOST
- Remove command overrides from imap-mcp and penpot-mcp
- Verify penpot-mcp and imap-mcp work correctly

.env

@@ -43,7 +43,7 @@ DISCOURSE_API_KEY=dummy-api-key-replace-with-real
 DISCOURSE_API_USERNAME=admin
 
 # IMAP
-IMAP_SERVER=imap.example.com
+IMAP_HOST=imap.example.com
 IMAP_PORT=993
 IMAP_USERNAME=user@example.com
 IMAP_PASSWORD=dummy-password-replace-with-real

docker-compose.yml

@@ -248,20 +248,20 @@ services:
       - ops
 
   # IMAP MCP - Email processing
+  # NOTE: This is a stdio-based MCP server, run on-demand by Crush via docker run
   imap-mcp:
     image: kneldevstack-aimiddleware-imap-mcp
     build:
       context: ./vendor/imap-mcp
-      dockerfile: Dockerfile
+      dockerfile: ../../dockerfiles/imap-mcp/Dockerfile
     container_name: kneldevstack-aimiddleware-imap-mcp
-    restart: unless-stopped
+    restart: "no"
     environment:
       - PYTHONUNBUFFERED=1
-      - IMAP_SERVER=${IMAP_SERVER}
+      - IMAP_HOST=${IMAP_HOST}
       - IMAP_PORT=${IMAP_PORT:-993}
       - IMAP_USERNAME=${IMAP_USERNAME}
       - IMAP_PASSWORD=${IMAP_PASSWORD}
-    command: ["uvx", "imap-mcp"]
     profiles:
       - ops
 
@@ -460,13 +460,14 @@ services:
   # ==========================================
 
   # Penpot MCP - Design collaboration platform
+  # NOTE: This is a stdio-based MCP server, run on-demand by Crush via docker run
   penpot-mcp:
     image: kneldevstack-aimiddleware-penpot-mcp
     build:
       context: ./vendor/penpot-mcp
       dockerfile: Dockerfile
     container_name: kneldevstack-aimiddleware-penpot-mcp
-    restart: unless-stopped
+    restart: "no"
     environment:
       - PENPOT_URL=${PENPOT_URL:-https://design.penpot.app}
       - PENPOT_TOKEN=${PENPOT_TOKEN}

dockerfiles/imap-mcp/Dockerfile

@@ -0,0 +1,24 @@
+FROM python:3.12-slim
+
+# Install uv for faster package management
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+
+WORKDIR /app
+
+# Copy dependency files
+COPY pyproject.toml ./
+
+# Install dependencies
+RUN uv sync --no-dev --no-install-project --no-cache
+
+# Copy source code
+COPY . .
+
+# Install the project
+RUN uv sync --no-dev --no-editable --no-cache
+
+# Set up environment
+ENV PYTHONUNBUFFERED=1
+ENV PATH=/app/.venv/bin:$PATH
+
+ENTRYPOINT ["python", "-m", "imap_mcp.server"]